OFFSET
1,1
EXAMPLE
5 is a term because 5^2 = 25 = (1^2 + 7^2)/2.
MATHEMATICA
Select[Range[1, 300, 2], SquaresR[2, 2 #^2] > 4 &] (* Giovanni Resta, Aug 18 2019 *)
PROG
(PARI) isok(n) = {if (n %2, for (i=1, n, x = 2*n^2-i^2; if ((x!=i^2) && (x>0) && issquare(x), return (i)); ); ); } \\ Michel Marcus, Aug 18 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
Mohsin A. Shaikh, Aug 18 2019
EXTENSIONS
More terms from Giovanni Resta, Aug 18 2019
STATUS
approved